Transmission for hand tractors



Jan. 16, 1951 E. ROSE TRANSMISSION FOR HAND TRACTORS 7 Sheets-Sheet 1 35 INVENTOR- BY ELJ2O6 1 lkll I I I I llll klll Filed July 19, 1945 Jan. 16, 1951 E. L. ROSE TRANSMISSION FOR HAND TRACTORS 7 Sheets-Sheet 3 Filed July 19, 1945 WWW Jan. 16,- 1951 ROSE 2,5

TRANSMISSION. FOR HAND TRACTORS Filed July 19. 1945 7 She et s-Sheet 4 Jan. 16, 1951 E. ROSE TRANSMISSION FOR HAND TRACTQRS Filed July 19, 1945 7 Sheets-Sheet 5 E. L. ROSE TRANSMISSION FOR HAND TRACTORS Jan. 16, 1951 Filed July 19, 1945 7 Sheets-Sheet 7 Patented Jan. 16, 1951 Eustace Loring Rose, Charleston, W. Va., assignor to Gravely Motor Plow & Cultivator Company,

Dunbar, W. Va.

Application July 19, 1945, Serial No. 605,977

This invention relates to transmissions for hand tractors.

An object of this invention is to provide a transmission equipped with reversible means whereby the device may be quickly reversed so as to facilitate movement of the tractor or driving means.

Another object of this invention is to provide a transmission of this kind which is coupled to a prime mover in the form of an internal combustion engine and which includes a drive shaft having mounted on its forward end a coupling means for coupling attachments of Various kinds to the drive shaft.

A further object of this invention is to provide a transmission of this kind which is closely coupled so that it will occupy only a small amount of space thereby providing a compact power means for operating a rotary plow, a mower or other implement.

To the foregoing objects, and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and. arrangement of parts, as will be more specifically referred to and illustrated in the accompanying drawings, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention as claimed.

' In the drawings:

Figure 1 is a fragmentary vertical section of an internal combustion engine which is coupled with the transmission,

Figure 2 is a fragmentary vertical section of the transmission which is coupled to the engine shown in Figure 1,

Figure 3 is an enlarged fragmentary sectional view of the lower portion of the engine,

Figure 4 is a fragmentary vertical section of the intermediate portion of the transmission,

Figure 5 is a fragmentary vertical section of the rear portion of the transmission,

Figure 6 is a sectional view taken on the line 6-3 of Figures 2 and 5,

Figure '7 is a sectional view taken on the line 'I'! of Figure 5, and

Figure 8 is a detail side elevation of the shifting, fork for the transmission.

Referring to the drawings, the numeral I designates generally an internal combustion engine including a crank case II and one or more cylinders I2 connected to the crank case. The crank case II has rotatably mounted therein a crank shaft l3 which is journalled in bearings 14 and I and the crank shaft [3 has mOunted 1 Claim. (Cl. 74768) 2 on the rear portion thereof a sprocket I6 with which a chain I1 is engaged. The chain II: also engages about a sprocket ,I8 which is' car-e ried by a cam shaft I9. A timer is operated by the cam shaft I9 and the timer 2!) is of con-Y ventional construction.

A grooved pulley fl is mounted on the rearend portion of the crank shaft I 3 and has trained thereabout a belt 22 which is also trained about a fan pulley 23; The fan pulley 23 has "secured thereto a fan 24 and a guard 25 engages the rear portion of the fan 24. A generator '25 is also secured to the pulley 23 and the generator 26 is supported by means of a bracket arm 21 engaging a bolt 28 by means of which the belt 22 may be maintained tight for operatingth'e generator 26 and the fan 24. The engine II!v also has associated therewith a starter motor 29 having a spring-pressed starter pinion 3! which is engageable with a gear 3| formed on a fly wheel 32. The fly wheel 32 is secured to the forward portion of the crank shaft I 3 and is positioned within a housing 33 extending from the forward end of the crank case II. The crank shaft I3 also has secured thereto a gear 34 which meshes with a gear 35 connected to a lubricating pump 35. A carburetor 3'! is also coupled with the engine Ill and is connected by means of a pipe 38 to a fuel tank 39. v

A shield 40 engages about the upper portion of the engine In and extends partly over the fuel tank 39 as indicated at 4!. Abatteryf 42, which is positioned in a battery housing 43 disposed forwardly of the fuel tank 39, is electrically coupled to the starter motor 29 and the genera v t-or 26 in, conventional manner by the medium of conductors M and 45. The extended portiorf. 45 of the shield 40 is secured by fastening members 46 to the upper rear portion of the battery housing 43, as shown more clearly in Figure 2. The fly wheel 32 also has extending from the forward side thereof an annular flange or clutch member 4'1. A plurality of clutch plates 48 are fixed relative to the flange or clutch member 41; and are slidable on ribs or keys 49 carried by the flange 41 and clutch elements 50 are correlated with the clutch members 49 and are keyed to. a:

rier 5I and the collar 53 is adapted at-its. rear end to-bearagainst the foremost of the: clutch plates 50, so as to bind the clutch plates 50 with respect to the clutch plates 48. The collar 53 is adapted to be moved forwardly to declutching position against the tension of a clutch engaging spring 55 which is disposed between the collar 53 and the hub 54 by means of a shifting fork 56. The shifting fork 56 is splined on a clutch operating shaft 51 which is extended outwardly of the clutch housing 33 and is operated in a conventional manner.

The clutch engaging spring 55 bears at its forward end against a ring 58 fixed relative to the clutch collar 53 and the ring 58 is adapted to engage at its forward end against an annular key or ring 59 which is carried by the forward end of the hub 54. The hub G is internally splined and has positioned therein the rear end of a drive shaft Gil. The drive shaft Bil extends forwardly and is provided with a splined forward end 6|. A toothed coupling collar 62 is spline-d on, the spline 5i and is shifted endwise to either a coupling or released position by means of a shifting fork 63 carried by a shaft 6 The shaft 55 extends horizontally in a coupling housing 55 and is provided with the usual connections by means of which the shaft 64' may be selectively rocked to shift the coupling member 62- rearwardly to released position, as shown in Figure 5., or to shift the coupling member 2 forwardiy to coupling position for engagement with a complementary toothed coupling member 56 which is splined on a driven shaft E7. The driven shaft 61 extends through the forward wall of the coupling housing 65 and anti-friction bearing. 69 carried by the wall 38 rotatably supports the rear end of the driven shaft bl. The wall E8 is detaohably secured to the coupling housing 35 by fastening members "it by means of which the driven shaft 57 may be removed with any implement associated therewith and different types of implements, such as mowers, plows or other earth working implements, may be operatively coupled to the driving mechanism.

The drive shaft 60 has splined 0n the splines 6| rearwardly of the coupling member 52, a gear or pinion H which is formed with a relatively long hub 12. The gear or pinion it comprises the sun gear of a planetary transmission which is positioned in a transmission housing is extending from the rear end of the coupling housing 65.

The sun gear H, as shown in Figure '7, has meshing therewith a plurality of planet gears The planet gears 76 are rotatably mounted on stub shafts 75 which are secured between a pair of disk-shaped plates i6 and ii. A sleeve 78 interposed between each stub shaft '55 and the planet gear and provides a spacer for holding two plates H3 and H in spaced apart relation. The sleeves 18 also provide a bearing for each planet gear 14. The plate '16 is formed with a cylindrical hub T9 which in splined on the forward end of a tubular shaft 83. The shaft 83 is disposed about the drive shaft 56 and extends rearwardly from the transmission housing 13. The planet gears i l constitute the forward drive gears for operating the tubular shaft 33 to effect forward movementof the tractor body associated with this device. A ring gear BI is disposed about the planet gears M and meshes with each of thesegears and is carried by an annulas 83, which is fixed relative to the ring gear 3! andhas formed integral therewith a plurality of radially arranged arms 83 carried by a cylindrical hub which is loose on the periphery of the hub l9.

The periphery of the ring gear BI is of frustoconical configuration as indicated by the numeral 85 and forms one element of a brake by rose .5 of which the ring gear 8! may be held against rotation. The planet gears Hi have formed integrally therewith secondary planet gears which extend forwardly from the gears l z The secondary planet gears 83 which constitute reversing gears, as shown in Figure '7, are adapted to mesh with idler gears 87. The idler gears are rotatably mounted on shafts 33 fixed between the two plates l6 and i? and the idler gears 81 are rotatable on spacer sleeves gaging about the shafts 83. The idler gears 8? are in constan mesh with a ring gear the gear 9% is carried by an annulus ill. The annulus SI has fixed thereto a plurality of radially arranged arms 92 which are carried by an inwardly projecting hub 93 which is rotatable about the hub ?2 of the sun gear H. A thrust bearing 94 is interposed between the inner circle of the plate Ti and the hub 93 so that the spider formed. by the hub 93, the arms 92 and the annulus 5| may freely rotate relative to the hub E2 of the sun gear. The forward end of the hub 2 of the sun gear is reduced in diameter as indicated at 95 for receiving the inner race of an anti- "riction bearing. The outer race 9? of this antifriction bearing engages in an annular flange 98 carried by a plate The plate 539 is fixed relative to a dividing wall It?) between the coupling housing to and the transmission housing '53.

The inner or rear end of the flange 98 is adapted to bear against the forward side of an annular flange ill! carried by the hub 93 and forming part of the spider. The annular flange l0! also bears against the outer race 91 of the anti-friction bearing. The outer surface of the ring gear 9|] is of frusto-conical configuration as indicated by the numeral I02 and forms one element of a reversing brake. The confronting ends of the two rings gears 8! and 9B are in substantial contact with each other and the frusto-conical brake surfaces 85 and I02 form a V-shaped brake means within which a fibrous brake rin 163 carried by a band 104 is adapted to engage. The inner surface of the band M33 as indicated at Hi l is of V-shaped configuration, so that endwise movement of the band I04 will effect gripping T engagement of this band with either ring member 8| or ring member 9!]. The band [M is formed with opposed pairs of ears I05 and 106, as shown in Figure '7, between which band shifting rods I0! and H18 respectively are adapted to engage. The rod [Ell is formed with a peripheral notch I09 within which the band M4 is adapted to engage and the rod I08 is formed with a notch H0 within which the band I64 is adapted to engage.

By providing the diametrically opposed rods 10'! and H38, the band 18 will be shifted endwise in an even manner so as to provide for braking of one or the other of the ring gears. The rod I0! is slidable endwise in a pair of bushing HI and H2, which are carried by an offset housing I I3 formed as part of the housing 13 and a complementary offset housing H4 carried by a plate H5 supports the bushing III in alignment with the bushing H2. The rod I0! is shifted endwise by means of a stud H6 fixed in a socket H1 carried by a band shifting fork I It and which loosely engage in a slot l lE--a formed in rod 101. The rod IE8 is slidable in a pair of bushings H9 and I2!) carried by laterally offset and aligned hous- 7 ings. l2! and [22. The rod. I08 is shifted endwise by means of a stud I23 fixed in a socket I24 carried by the fork I I8 and engaging in a slot I23-a formed in rod I08.

The fork II8. as shown in Figure 8, is formed with a pair of oppositely extending arms I25 and I26 which are carried by a sleeve I21. A fork operating shaft I28 is fixed in the sleeve I2! and has secured thereto the hub I29 of a'fork shifting lever I30. In order to provide for maintaining the fork I I8 and the rods I01 and I08 in a neutral position, I have provided a spring I3I which is fixed, as at I32, to the offset housing I 22 and is formed with a V-shaped forward end I33. The forward end I33 of the spring I3I is adapted to engage in a notch I34, which is formed in the outer side of the rod I08. It will be understood that the shifting lever i may be locked in either forward or reversed position by suitable means (not shown), such as a toothed quadrant, which is engaged by a sprin pressed pawl or the like.

The plate H5 has extending rearwardly therefrom a shaft enclosing sleeve I35. The sleeve I35 is formed integral with the plate H5 and also is formed integral with the intermediate housing 33. The tubular shaft 80 is journalled in antifriction bearings I36 disposed within the forward end of the sleeve I35 and adjusted endwise by means of an annular nut I31 which is threaded in the forward end of the sleeve I35. The nut I3? is formed with a plurality of teeth I38 by means of which a spanner Wrench or the like may be.

engaged with the nut, so as to tighten or loosen the nut and in order to hold this nut against rotation, I have provided a locking member I 39 carried by a cap screw I40 which is threaded into the forward portion of the sleeve I35 and engages between selected pairs of the teeth I38. The sleeve I35, as shown in Figure 4, is cut out in the lower portion thereof, as indicated at I4I so as to provide space within which a ring and worm gear I42 may engage. A worm I43 is keyed or splined on the tubular shaft 80 in the space formed by the cutout I4I of the sleeve I35 and preferably a spacer sleeve I44 is interposed between the forward end of the worm I43 and the anti-friction bearing I36.

A second anti-friction bearing I45 engages about the rear end portion of the shaft 80 being disposed in the rear end of the sleeve I35 and a spacer sleeve I46 is interposed between the antifriction bearing I45 and the rear end of the worm I43. The ring gear I42 forms part of a differential gearing which has rotatably mounted on a stub shaft I41 a pair of beveled pinions I48 for driving an axle I of the tractor. The pinions I 48 mesh with a beveled gear I 49 which is splined on the axle I50. It will be understood that axle I50 is formed as two transversely disposed aligned shafts and that the ring gear I42 is fixed relative to one and that the bevel gear I49 is splined to the other shaft. The housing 33 is formed with an oil sump or well I5! within which a strainer I52 connected to a suction pipe I53 engages, and the pipe I53 is connected in a conventional manner to the lubricating pump 36 on the intake side thereof. An oil discharge pipe I54 is connected to the top of the coupling housing and is also connected to the outlet side of the pump 36 for discharging lubricating oil into the coupling housing 65, from which the lubricant will flow downwardly by gravity through the transmission housing I3 and into the intermediate or differential housing 33.

In the use and operation of this power device, the engine I0 is operated in the usual manner and initially the clutch formed by the plates 48 and 50 will be in disengaged position. When it is desired to move the device over the ground, it being understood that the axles I50 will have wheels mounted on the outer ends thereof, the clutch shifting fork 56 is rocked to lock the clutch elements 48 and 50 together. When these clutch elements 48 and 50 are locked together, drive shaft 60 will rotate as a unit with crank shaft I3. Assuming that it is desired to move the device forwardly over the ground, lever I30 is rocked rearwardly so as to cause band I03 to frictionally lock gear 8| against rotation. With gear 8i held against rotation, the planet gears I4 will rotate within the ring gear 8| and cause plates I6 and TI to rotate about the tubular shaft and thereby effect said rotation of shaft 80. As planet gears I4 rotate Within the stationary ring gear BI which is held against rotation, plates is and II will rotate and as plate I6 is splined to tubular shaft 80 through the hub I9, shaft 80 will rotate to effect forward rotation of the axles I50. Quick reverse rotation of axles I 50 is obtained by rocking lever I30 forwardly and looking ring gear against rotation. With ring gear 90 held against rotation, planet gears 86 are in driving relation with respect to idler gears 81 and in this manner these gears will rotate within ring gear 90 and tubular shaft 80 will be rotated in a reverse direction.

When ring gear 8i is held stationary, ring gear 96 may rotate freely and when ring gear 9I is held against rotation, ringgear 8| may freely rotate. If it is desired to operate the implement or attachment connected to shaft 61, coupling member 62 is shifted forwardly to effect engagement with coupling member 66. Shaft 61 will rotate at the same speed as shaft 60. In effecting reverse rotation of the axles I50, the clutch members 48 and 50 may be left in clutching position as the shifting of the band I04 and the braking band I03 will constitute a releasing means so as to prevent damage to the gears of the planetary transmission during the changing of the movement of the device over the ground.

This device is constructed as a compact driving unit operated from a conventional internal combustion engine and unit which may be mounted on a pair of wheels so that the device can be readily guided over the ground.

The exact configuration illustrated is regarded as the optimum, but some of the desirable results inherent in this disclosure may be obtained by various slight modifications including some departure from the exact configuration shown, and it is therefore requested that the scope of the invention should be regarded as limited only by the terms of the claim.

What I claim is:

A planetary transmission comprising a drive shaft, a sun gear fixed on said drive shaft, a pair of plates rotatable about said drive shaft, planet gears carried by said plates, reversing gears carried by one of said plates, a pair of ring gears, one of said ring gears meshing with said planet gears, the other of said ring gears meshing with said reversing gears, opposed frustro-conical brake elements on the periphery of said ring gears disposed in inwardly convergent relation, a single brake band about both of said brake elements and havin a bearing surface comple-v mentary thereto, and means sliding said brake band axially of said transmission for friction:- ally engaging a selected one of said brake elements, said means including a pair of rods secured to said brake band at diametrically op- REFERENCES CITED The following references are of record in the file of this patent:

Number Number 3 UNITED STATESYPATENTS Name Date Harvey Septe29, 1903 Baukat Sept-4, 1917 HoWeth July 18, 1922 Link Sept. 8, 1925 Danly Sept. 6, 1927 Rowledge Dec. 27, 1927 Weingartner Nov. 29, 1932 FOREIGN PATENTS Country Date Netherlands July 16,1928 Switzerland Apr. 30, 1943 

